SERVICES

Lightning strike is a kind of electrostatic discharge phenomenon that carry millions of volts of voltage from a cloud to the ground. During transmission,the lightning creates an electromagnetic field in the air. Because of electromagnetic induction, a powerful voltage (surge) is suddenly generated in the power line,as well as a strong induced current that can transmit for miles. transient changes in current and voltage make the circuit unstable.these indirect attacks usually occur on exposed power lines in the open air, such as street lights, traffic lights, base stations and other equipment that emit power surges. The surge protection module is directly facing the surge interference from the power line at the front of the circuit. It transfers or absorbs the surge energy to minimize the surge threat to other working circuits, such as AC/DC power units in LED lighting fixtures. For LED street light, lightning will cause an inductive surge in the power line. Then a protruding wave will form in the power wire due to the energy of this inductive surge. that is surge wave. Surge wave transmits in the inductive way. when a surge suddenly occurs in the power line , a tip will be superposed on the sine wave of power transmission line.As the tip spreads into the street lamp,it will damage the circuit of led street lamp . Street lamps have been around for very many years. But why the surge protection of street lights is just purposed in recent years ? in fact , the conventional HPSL(high pressure sodium lamp ) and super high voltage mercury lamp are designed with high pressure resistance. they own lightning protection effect in themselves. Until recent years, led street light have been gradually popularized. LED street lights , differ from previous traditional road lights , need a comparatively small power supply voltage, which is usually driven by converting alternating current to direct current by using a driver power device . as a result , the lightning protection capability of led street lights themselves has been eliminated. Therefore, surge protection modules need to be specially designed for led street lights.